TY JOUR TI Resonant Defects: A New Approach to Highly-Sensitive Ultrasound-Activated NDT Techniques KW local defect resonance KW ultrasonics KW vibration resonance KW acoustic resonance KW shearography KW acoustic waves JO NDT World AU Solodov, I.. AU Kreutzbruck, M.. PY 2015 IS 19 PB LLC SVEN